https://www.youtube.com/watch?v=wbSwFU6tY1c&feature=youtu.be...
If it were two different cameras we'd see two different landing pads. In the end of the video both feeds are coming down on the northern pad.
Edit: Here's the sat image from december with notes added https://imgur.com/a/u6sLs
Since they are on the same rocket, you see them land on the same pad.
The rockets have redundant cameras, and through a probable misconfiguration we saw two feeds from two cameras on one rocket.
Wasn't intentional, but oops.
I think you're right.
https://youtu.be/wbSwFU6tY1c?t=37m10s "even though those look very similar those ... are representative of different boosters"
The live (uncorrected) version for comparison: https://www.youtube.com/watch?v=j8wxV-lUsZg